GNU Radio 3.7.1-52 C++ API
basic_trellis_encoder_impl.h
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/* -*- c++ -*- */
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/*
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* Copyright 2002 Free Software Foundation, Inc.
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*
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* This file is part of GNU Radio
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*
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* GNU Radio is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3, or (at your option)
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* any later version.
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*
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* GNU Radio is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNU Radio; see the file COPYING. If not, write to
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* the Free Software Foundation, Inc., 51 Franklin Street,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef _ATSC_BASIC_TRELLIS_ENCODER_H_
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#define _ATSC_BASIC_TRELLIS_ENCODER_H_
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#include <
gnuradio/atsc/api.h
>
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#include <assert.h>
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/*!
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* \brief ATSC trellis encoder building block.
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*
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* Note this is NOT the 12x interleaved interface.
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*
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* This implements a single instance of the ATSC trellis encoder.
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* This is a rate 2/3 encoder (really a constraint length 3, rate 1/2
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* encoder with the top bit passed through unencoded. This does not
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* implement the "precoding" of the top bit, because the NTSC rejection
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* filter is not supported.
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*/
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class
ATSC_API
atsci_basic_trellis_encoder
{
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private
:
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int
state;
// two bit state;
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public
:
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atsci_basic_trellis_encoder
() : state (0) {}
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/*!
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* Encode two bit INPUT into 3 bit return value. Domain is [0,3],
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* Range is [0,7]. The mapping to bipolar levels is not done.
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*/
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int
encode
(
unsigned
int
input);
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//! reset encoder state
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void
reset
() { state = 0; }
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static
const
unsigned
char
next_state[32];
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static
const
unsigned
char
out_symbol[32];
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};
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#endif
/* _ATSC_BASIC_TRELLIS_ENCODER_H_ */
gnuradio
gr-atsc
include
gnuradio
atsc
basic_trellis_encoder_impl.h
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